Specifications Comparison: 2006 GMC Sierra 1500 vs 2023 GMC Sierra 1500

Legroom

Trim	Eng.	Drive train	1st Row Legroom (in)	2nd Row Legroom (in)
1500 Extended Cab SL	V6	RWD	41.3	33.7
1500 Extended Cab SL	V8	4WD	41.3	33.7
1500 Extended Cab SLE	V8	RWD	41.3
1500 Extended Cab SLE	V8	4WD	41.3	33.7
1500 Regular Cab SL	V6	RWD	41.3
1500 Regular Cab SL	V6	4WD	41.3
1500 Regular Cab SLE	V8	RWD	41.3
1500 Regular Cab SLE	V8	4WD	41.3
1500 Crew Cab SL	V8	RWD	41.3	39.1
1500 Crew Cab SL	V8	4WD	41.3	39.1
1500 Crew Cab SLE	V8	RWD	41.3	39.1
1500 Crew Cab SLE	V8	4WD	41.3	39.1
1500 Crew Cab SLT	V8	RWD	41.3	39.1
1500 Crew Cab SLT	V8	4WD	41.3	39.1
1500 Extended Cab SLT	V8	RWD	41.3	33.7
1500 Extended Cab SLT	V8	4WD	41.3	33.7
1500 Extended Cab SLE	V8	RWD	41.3	33.7
1500 Extended Cab SLE	V8	4WD	41.3	33.7
HD 1500 Crew Cab SLE	V8	RWD	41.3	38.8
HD 1500 Crew Cab SLE	V8	4WD	41.3	38.8
HD 1500 Crew Cab SLT	V8	RWD	41.3	38.8
HD 1500 Crew Cab SLT	V8	4WD	41.3	38.8
Crew Cab Denali	V8	AWD	41.3	39.1

Trim	Eng.	Drive train	1st Row Legroom (in)	2nd Row Legroom (in)
Denali Crew Cab 147"	5.3L V8	RWD	44	43
Denali Crew Cab 147"	5.3L V8	4WD	44	43
Denali Crew Cab 157"	5.3L V8	4WD	44	43
Elevation Crew Cab 147"	2.7L	RWD	44	43
Elevation Double Cab 147"	2.7L	RWD	44	35
Elevation Crew Cab 147" w/ 3SB	2.7L	4WD	44	43
Elevation Crew Cab 147" w/ 3VL	2.7L	4WD	44	43
Elevation Crew Cab 157"	2.7L	4WD	44	43
Elevation Double Cab 147" w/ 3SB	2.7L	4WD	44	35
Elevation Double Cab 147" w/ 3VL	2.7L	4WD	44	35
Pro Crew Cab 147"	2.7L	RWD	44	43
Pro Double Cab 147"	2.7L	RWD	44	35
Pro Reg Cab 126"	2.7L	RWD	44
Pro Reg Cab 140"	2.7L	RWD	44
Pro Crew Cab 147"	2.7L	4WD	44	43
Pro Crew Cab 157"	2.7L	4WD	44	43
Pro Double Cab 147"	2.7L	4WD	44	35
Pro Reg Cab 126"	2.7L	4WD	44
Pro Reg Cab 140"	2.7L	4WD	44
SLE Crew Cab 147"	2.7L	RWD	44	43
SLE Double Cab 147"	2.7L	RWD	44	35
SLE Crew Cab 147"	2.7L	4WD	44	43
SLE Crew Cab 157"	2.7L	4WD	44	43
SLE Double Cab 147"	2.7L	4WD	44	35
SLT Crew Cab 147"	5.3L V8	RWD	44	43
SLT Crew Cab 147"	5.3L V8	4WD	44	43
SLT Crew Cab 157"	5.3L V8	4WD	44	43
AT4 Crew Cab 147"	3.0L I6	4WD	44	43
AT4 Crew Cab 157"	3.0L I6	4WD	44	43
AT4X Crew Cab 147"	6.2L V8	4WD	44	43
Denali Ultimate Crew Cab 147"	6.2L V8	4WD	44	43

Trim	Eng.	Drive train	1st Row Legroom (cm)	2nd Row Legroom (cm)
1500 Extended Cab SL	V6	RWD	104.9	85.6
1500 Extended Cab SL	V8	4WD	104.9	85.6
1500 Extended Cab SLE	V8	RWD	104.9
1500 Extended Cab SLE	V8	4WD	104.9	85.6
1500 Regular Cab SL	V6	RWD	104.9
1500 Regular Cab SL	V6	4WD	104.9
1500 Regular Cab SLE	V8	RWD	104.9
1500 Regular Cab SLE	V8	4WD	104.9
1500 Crew Cab SL	V8	RWD	104.9	99.3
1500 Crew Cab SL	V8	4WD	104.9	99.3
1500 Crew Cab SLE	V8	RWD	104.9	99.3
1500 Crew Cab SLE	V8	4WD	104.9	99.3
1500 Crew Cab SLT	V8	RWD	104.9	99.3
1500 Crew Cab SLT	V8	4WD	104.9	99.3
1500 Extended Cab SLT	V8	RWD	104.9	85.6
1500 Extended Cab SLT	V8	4WD	104.9	85.6
1500 Extended Cab SLE	V8	RWD	104.9	85.6
1500 Extended Cab SLE	V8	4WD	104.9	85.6
HD 1500 Crew Cab SLE	V8	RWD	104.9	98.6
HD 1500 Crew Cab SLE	V8	4WD	104.9	98.6
HD 1500 Crew Cab SLT	V8	RWD	104.9	98.6
HD 1500 Crew Cab SLT	V8	4WD	104.9	98.6
Crew Cab Denali	V8	AWD	104.9	99.3

Trim	Eng.	Drive train	1st Row Legroom (cm)	2nd Row Legroom (cm)
Denali Crew Cab 147"	5.3L V8	RWD	111	109
Denali Crew Cab 147"	5.3L V8	4WD	111	109
Denali Crew Cab 157"	5.3L V8	4WD	111	109
Elevation Crew Cab 147"	2.7L	RWD	111	109
Elevation Double Cab 147"	2.7L	RWD	111	88
Elevation Crew Cab 147" w/ 3SB	2.7L	4WD	111	109
Elevation Crew Cab 147" w/ 3VL	2.7L	4WD	111	109
Elevation Crew Cab 157"	2.7L	4WD	111	109
Elevation Double Cab 147" w/ 3SB	2.7L	4WD	111	88
Elevation Double Cab 147" w/ 3VL	2.7L	4WD	111	88
Pro Crew Cab 147"	2.7L	RWD	111	109
Pro Double Cab 147"	2.7L	RWD	111	88
Pro Reg Cab 126"	2.7L	RWD	111
Pro Reg Cab 140"	2.7L	RWD	111
Pro Crew Cab 147"	2.7L	4WD	111	109
Pro Crew Cab 157"	2.7L	4WD	111	109
Pro Double Cab 147"	2.7L	4WD	111	88
Pro Reg Cab 126"	2.7L	4WD	111
Pro Reg Cab 140"	2.7L	4WD	111
SLE Crew Cab 147"	2.7L	RWD	111	109
SLE Double Cab 147"	2.7L	RWD	111	88
SLE Crew Cab 147"	2.7L	4WD	111	109
SLE Crew Cab 157"	2.7L	4WD	111	109
SLE Double Cab 147"	2.7L	4WD	111	88
SLT Crew Cab 147"	5.3L V8	RWD	111	109
SLT Crew Cab 147"	5.3L V8	4WD	111	109
SLT Crew Cab 157"	5.3L V8	4WD	111	109
AT4 Crew Cab 147"	3.0L I6	4WD	111	109
AT4 Crew Cab 157"	3.0L I6	4WD	111	109
AT4X Crew Cab 147"	6.2L V8	4WD	111	109
Denali Ultimate Crew Cab 147"	6.2L V8	4WD	111	109